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English word selfcest comes from English self, English incest
self (English)
(botany) A seedling produced by self-pollination (plural selfs).. (molecular biology, immunology) Any molecule, cell, or tissue of an organism's own (belonging to the self), as opposed to a foreign (nonself) molecule, cell, or tissue (for example, infective, allogenic, or xenogenic).. An individual person as the object of his own reflective consciousness (plural selves).. The subject of [...]
incest (English)
To engage in sexual intercourse with a relative. Sexual relations between close relatives, especially immediate family members and first cousins, usually considered taboo; in many jurisdictions, close relatives are not allowed to marry, and incest is a crime.
selfcest (English)
(fiction, slang) Sexual activity with an alternate version of oneself, such as a clone or a version of oneself from the past, future, or an alternate universe.